Page "Havok (comics)" Paragraph 48
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Havok's body is constantly absorbing cosmic radiation.
When his body reaches its capacity, excess energy is then immediately re-emitted in negligible quantities.
The circle on his chest is an indicator as how much energy he has left.
Upon the expenditure of all his available energy, it takes Havok about 17 hours to recharge to peak level.
The concentration involved in releasing his energy in focused beams is exhausting for Havok, especially if he does it over an extended period.
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